How to remove all characters from a string, except the integers?

BoQsc vaidas.boqsc at
Thu Mar 3 12:14:13 UTC 2022

I need to check if a string contains integers,
and if it contains integers, remove all the regular string 
I've looked around and it seems using regex is the only closest 

import std.stdio;

void main(string[] args){

	if (args.length > 1){
		write(args[1]); // Needs to print only integers.
	} else {
		write("Please write an argument.");

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